CN114247930A

CN114247930A - Hand-held work apparatus

Info

Publication number: CN114247930A
Application number: CN202111114637.XA
Authority: CN
Inventors: L·巴特克; M·厄斯特勒; J·赛茨; V·曼
Original assignee: Andreas Stihl AG and Co KG
Current assignee: Andreas Stihl AG and Co KG
Priority date: 2020-09-23
Filing date: 2021-09-23
Publication date: 2022-03-29
Also published as: US11642773B2; EP3974114A1; US20220088763A1

Abstract

The invention relates to a handheld work apparatus, wherein the work apparatus comprises a housing (2), a drive motor (3) for driving a tool (4), and a handle (5) arranged on the housing (2). A contour (13) is provided on the handle (5) and a mating contour (15) is provided on the housing (2). In the stop position (23) of the handle (5), a minimal friction torque (M) acting about the pivot axis (6) is provided between the handle (5) and the housing (2)₁). In the operating position (21,22) of the handle (5), the contour (13) and the counter contour (15) are in operative connection such that a further friction torque (M) acting about the pivot axis (6) is present between the handle (5) and the housing (2)₂). Additional friction torque (M) in the operating position (21,22)₂) Greater than the minimum friction torque (M) in the rest position (23)₁)。

Description

Hand-held work apparatus

Technical Field

The invention relates to a hand-held power tool (Arbeitsger ä t).

Background

Hand-held power tools are known, which have a housing and a handle (Handgriff) pivotable on the housing. The handle and the housing are connected via a rotary joint (Drehgelenk) formed by a journal (Zapfen, sometimes also referred to as a pin) and a journal receptacle. A sealing ring is arranged between the journal and the journal receptacle, which ring causes a play compensation and thus prevents tilting of the handle relative to the housing when the handle is turned (Kippen). The sealing ring causes damping when the handle is rotated relative to the housing, whereby the operator obtains a feeling of high value. In the case of such a design of the swivel joint, it is disadvantageous that the swivel joint becomes stiff due to contamination between the housing and the handle (schwerg ä ngig). This situation negatively affects not only the feel of the work apparatus but also the function of the rotation.

Disclosure of Invention

The invention is therefore based on the object of further developing a working device of this type in such a way that the feel during the turning of the handle is increased and at the same time a high functionality of the working device is ensured.

This object is achieved by a work apparatus comprising a housing, a drive motor for driving a tool (Werkzeug, also sometimes referred to as a tool) and a handle arranged at the housing, wherein the handle is mounted on the housing in a pivotable manner about a pivot axis, wherein the handle can be pivoted into at least one operating position and into at least one inoperative position, wherein a contour is provided at the handle and a counter contour (Gegenkontru) is provided at the housing, and wherein the contour and the counter contour are configured such that, so that in the inoperative position of the handle a minimal friction moment acting about the pivot axis is provided between the handle and the housing, and in the operating position of the handle the contour and the counter contour are in operative connection in such a way that a further frictional torque acting about the pivot axis is present between the handle and the housing, wherein the further friction torque in the operating position is greater than the minimum friction torque in the inactive operating position.

The handheld work apparatus according to the invention comprises a handle arranged on the housing, which is mounted on the housing so as to be pivotable about a pivot axis. The handle can be pivoted into at least one operating position and into at least one inoperative position. A profile is provided at the handle and a mating profile is provided at the housing. The contour and the counter contour are designed in such a way that in the inoperative position of the handle a minimal friction torque acting about the pivot axis is provided between the handle and the housing, and in the operative position of the handle the contour and the counter contour are in operative connection in such a way that a further friction torque acting about the pivot axis is present between the handle and the housing. The additional friction torque in the operating position is greater than the minimum friction torque in the rest operating position. If the operator rotates the handle about the pivot axis, the operator must apply an increased friction torque in order to reach the operating position. The increased torque is used to communicate its approach to the operating position to the operator. This effect gives the operator a high quality feeling of the work implement. The term friction torque is to be understood as meaning the torque that is possible and transmittable between the handle and the housing by means of the contour and the counter contour.

It is advantageously provided that a bearing gap (lagersyield) is provided between the handle and the housing in the inoperative position of the handle, and that the contour and the counter-contour are in operative connection in the operative position of the handle in such a way that the housing and the handle are tensioned against one another. The operator is informed by the bearing play between the handle and the housing that the work apparatus is not ready for operation. In addition, the handle and the housing can be pivoted more easily relative to one another in the inoperative position. The housing and the handle are only tensioned against one another by twisting into the operating position of the handle. Thereby, the handle and the housing are fixed to each other, thereby conveying a high quality sensation to the operator and suggesting the operating position of the work implement.

The bearing play is preferably a bearing play radial to the pivot axis. The bearing play is preferably cancelled in the operating position of the handle by the interaction of the contour of the handle and the mating contour of the housing. By the bearing play in the inoperative position, contamination between the housing and the handle can be resolved. It is thus avoided that contamination between the handle and the housing leads to a locking when the handle is pivoted.

The contour is preferably configured as a projection at the handle. The mating contour is in particular configured as a housing projection. It is preferably provided that the contact surfaces of the contour and of the counter-contour, which are in operative connection with one another, are configured with one another such that the friction torque increases when the handle is pivoted out of the inoperative position into the operative position. Thus, the protrusion of the handle and the housing protrusion are in contact, thereby establishing only partial contact between the handle and the housing. The contact of the parts can be designed as desired by the design of the projections, whereby the friction torque to be transmitted can be adjusted. By means of the design of the projection, the friction torque can be adjusted, for example, functionally as a function of the angle of rotation of the handle relative to the housing. The tightness and thus the magnitude of the friction torque can be adjusted by the height of the protrusions of the handle and of the housing protrusions.

The bearing of the housing and the handle to one another is preferably formed by a journal bearing in the receptacle. The bearing journal is preferably formed on the handle and the receptacle is formed, in particular, on the housing. The handle can thus be swiveled relative to the housing by means of the receptacle and the journal. The receptacle and the journal thus form a radial bearing.

It is advantageously provided that at least two, in particular at least three, preferably at least four contours are provided at the handle. Other numbers of profiles at other handles may also be suitable. The contours at the handle are preferably arranged offset to one another at a uniform angular distance (Winkelabstand). The number of profiles preferably corresponds to the number of mating profiles. An increase in the friction can also be achieved with an increase in the number of contours if the contours and counter-contours are offset uniformly with respect to one another. Furthermore, it is also possible, by increasing the number of profiles, to reduce the profiles themselves in their radial elevations and thus to reduce material wear when mating profiles and profiles are joined. Preferably, the number of contours can be adapted to the number of operating positions of the handle.

It is advantageously provided that a locking device (blockier vorticichtmg) which is configured separately from the contour and the counter-contour is provided for locking the handle in the operating position. The contour and the counter contour are therefore designed in such a way that if a separately designed locking device is also present in the locked position, a friction increase or a tensioning of the housing and the handle results. The contour and the counter contour are therefore configured such that they preferably engage when the locking device is locked in the operating position of the handle.

Drawings

Further features of the invention emerge from the description and the drawing, in which a detailed description of an embodiment of the invention is shown below. Wherein:

fig. 1 shows a perspective view of a handheld work apparatus according to the invention in an unswept operating position of the handle,

figure 2 shows the hand-held power tool according to figure 1 in a rest position of the handle in a perspective view,

figure 3 shows the hand-held power tool according to figure 1 in a pivoted operating position in a perspective view,

figure 4 shows the handle in a perspective view,

figure 5 shows the locking device in a partial cross-sectional view of the working instrument,

figure 6 shows the lock receiving portion of the locking device in a cross-sectional view of the housing,

figure 7 shows the hand-held power tool according to figure 1 in a first operating position in a side view,

figure 8 shows the hand-held work apparatus in a sectional view along arrow XIII in figure 7,

figure 9 shows in a partial cross-sectional view the contour of the handle and the mating contour of the housing according to section a in figure 8,

figure 10 shows the hand-held work apparatus according to figure 1 in a side view in an inoperative position,

figure 11 shows the hand-held working instrument in a sectional view along arrow XI in figure 10,

figure 12 shows in a partial cross-sectional view the contour of the handle and the mating contour of the housing according to section B in figure 11,

figure 13 shows a further embodiment of a work apparatus according to the invention in a operating position of the handle in a perspective view,

figure 14 shows in a perspective view the handle of the work apparatus according to section C of figure 13 in the operating position,

figure 15 shows the handle of the work apparatus according to figure 13 from above in a rest position in a perspective view,

figure 16 shows the handle of the work apparatus according to figure 13 in a rest position from below in a perspective view,

figure 17 shows in a partial section view the profile of the handle and the mating profile of the housing in engagement in the operating position,

fig. 18 shows the contour and the counter contour of the working device according to section D according to fig. 8 in a partial section along arrow XVIII in fig. 8.

Detailed Description

Fig. 1 shows a hand-held power tool 1, which in the present exemplary embodiment is configured as a hedge trimmer (heckenscher). The work apparatus 1 comprises a housing 2 in which a schematically illustrated drive motor 3 is arranged. The drive motor 3 drives a knife 4, which in the exemplary embodiment is embodied as a shear blade (Scherblatt) and projects from the housing 2. The drive Motor 3 is configured as an electric Motor (E-Motor) and is supplied with energy via a battery pack 26 as an energy source. In an alternative embodiment of the work apparatus 1, the drive motor 3 can also be designed as a combustion engine.

As shown in fig. 1, a front handle 27, which is designed in an arcuate manner, is fastened to the housing 2. The front handle 27 is arranged in the region between the housing 2 and the knife 4 and overlaps the knife 4. At the housing 2, on a side 29 facing the tool 4, a hand guard (Handschutz)28 is arranged, which extends approximately between the front grip 27 and the tool 4.

As shown in fig. 1, a rear handle (hereinafter referred to as handle 5) is arranged on a side 30 of housing 2 facing away from tool 4. As is also shown in fig. 4, the handle 5 has a closed base body 17. In an alternative embodiment, base 17 of handle 5 may also be designed to be open, so that handle 5 has a free end. The base body 17 of the handle 5 is designed in the preferred embodiment in multiple parts, i.e. from two grip shells (Griffschale) which can preferably be screwed onto one another. The handle 5 includes an operating lever 31 for controlling the motor power and a first latching lever 32 and a second latching lever 33 for releasing the operating lever 31. The handle 5 is mounted on the housing 2 so as to be pivotable about the pivot axis 6 by means of a mounting 9. The bearing 9 is formed by a receptacle 8 at the housing 2, into which the journal 7 of the handle 5 projects. In an alternative embodiment of the work apparatus 1, it may also be expedient to provide the receptacle 8 at the handle 5 and the journal 7 at the housing 2. In order to mount the handle 5 on the housing 2, the housing 2 is constructed in two parts in the preferred embodiment. The separating plane of the housing 2 lies in a vertical plane 60 of the work apparatus 1, which extends through the pivot axis 6 and in the direction of gravity in the position of the work apparatus 1 resting on a flat base. Furthermore, the work apparatus comprises a horizontal plane 61, which extends perpendicularly to the vertical plane 60. In an alternative embodiment of the work apparatus 1, the separating plane of the housing 2 is arranged exclusively parallel to the vertical plane 60. It may also be expedient to arrange the separating plane so as to be rotatable about the pivot axis 6 relative to the vertical plane 60.

As shown in fig. 4, the bearing journal 7 is of substantially cylindrical design, wherein the cylinder axis corresponds to the pivot axis 6 of the handle 5. The cylindrical journal 7 has a lateral surface 18, which serves as a radial support with respect to the pivot axis 6 relative to the inner surface 43 of the receptacle 8 of the housing 2. The side surface 18 of the journal 7 and the inner surface 43 of the receptacle 8 thus form a radial bearing 10 between the handle 5 and the housing 2. Furthermore, the journal 7 comprises a groove 19 which is formed in a side surface 18 of the journal 7. The groove 19 preferably completely surrounds the journal 7 and is formed coaxially to the pivot axis 6 at the journal 7. A shoulder 20 (fig. 5) engaging into the groove 19 is provided at the receptacle 8 of the housing 2. The groove 19 and the engaging shoulder 20 form a form-fitting connection in the direction of the pivot axis 6, whereby the handle 5 is supported in the axial direction relative to the housing 2. In an alternative embodiment of the work apparatus, it may be expedient to provide the groove 19 in the housing 2 and the shoulder 20 at the journal 7. The groove 19 of the shaft journal 7 and the shoulder 20 of the receptacle 8 engaging into the groove 19 of the shaft journal 7 thus form the axial bearing 11 between the handle 5 and the housing 2.

As shown in fig. 1 to 3, the handle 5 is mounted pivotably about a pivot axis 6 on the housing 2. The handle 5 can be pivoted from a first operating position 21 shown in fig. 1 into a second operating position 22 shown in fig. 3. In the first operating position 21 of the handle 5, a horizontal cut can preferably be performed, for example, in order to cut an approximately horizontally running upper side of a hedge. In the second operating position 22, starting from the first operating position 21, the handle 5 is pivoted by an angle α (fig. 8) of approximately 90 ° measured about the pivot axis 6. In an alternative embodiment of the work apparatus 1, it can be provided that the handle 5 can be pivoted through an angle α of approximately 45 ° in order to be moved from the first operating position 21 into the second operating position 22. In this second operating position 22, a vertical cut, for example at the outside of the vertical run of the hedge, can preferably be performed. When the handle 5 is pivoted out of the first operating position 21 into the second operating position 22, the handle 5 is in the inoperative position 23. In the inoperative position 23, the operation of the work apparatus 1 is not possible.

As shown in fig. 4, the work apparatus 1 includes a locking device 24. A locking device 24 is provided to lock the handle 5 in the operating positions 21, 22. As shown in fig. 5, the locking device 24 comprises at least two locking receptacles 35 arranged in the housing 2 and at least one locking contour 34 which interacts with one of the locking receptacles 35 in the operating positions 21, 22. The locking contour 34 is arranged at one end of a locking link (blockingsgried) 36. The locking element 36 has a longitudinal axis 37, along which the locking element 36 is movably mounted in the handle 5. It may be expedient to configure the locking element 36 to be rotatable. The handle 5 comprises a spring element 39, wherein the spring element 39 tensions the locking element 36 in the direction of the locking receptacle 35, in particular in relation to the locking receptacle 35 of the housing 2. The spring element 39 is supported at one end on the spring receptacle 38 of the locking element 36. The spring receptacle 38 is pin-shaped. In a preferred embodiment, the spring receptacle 38 is formed integrally with the locking element 36. The spring element 39 is supported with the other end against the handle 5. The spring element 39 is configured in the preferred embodiment as a helical spring. However, other embodiments of the spring element 39 or of the spring receptacle 38 may also be suitable.

Fig. 5 shows the locking device 24 in the locked position. The locking element 36 is thus tensioned in the direction of the housing 2, supported at the handle 5, by means of the spring element 39, whereby the locking contour 34 of the locking element 36 is tensioned into the locking receptacle 35 of the housing 2. The locking contour 34 and the locking receiver 35 form a form-fitting connection in the direction about the pivot axis 6, as a result of which a relative rotation between the handle 5 and the housing 2 about the pivot axis 6 is prevented. To unlock the locking device 24, the locking link 36 can be pulled away from the housing 2 against the spring force of the spring element 39. For this purpose, a planar holding attachment (halteauftatz) 40 is formed at the other end of the locking element 36. The holding attachment 40 is preferably formed integrally with the locking element 36. The holding attachment 40 is designed such that it can be gripped by an operator of the work apparatus 1, as a result of which the locking link 36 can be pulled against the spring force of the spring element 39 from the locking receptacle 35 of the housing 2. The positive connection between the locking contour 34 and the locking receiver 35 is eliminated. The locking device 24 is in the release position, whereby the handle 5 can be pivoted relative to the housing 2.

As shown in fig. 6, the locking device 24 comprises three locking

receptacles

35,35',35 ″ which are formed on the housing 2. In an embodiment, the locking

receptacle

35,35',35 ″ is arranged directly in the receptacle 8 of the housing 2. However, it may also be expedient to provide the locking

receivers

35,35',35 ″ in other regions of the housing 2. The locking

receiver

35,35',35 ″ is designed as a recess in the housing 2. The first locking receiver 35 is disposed between the second locking receiver 35' and the third locking receiver 35 ″. The first locking reception 35 has an angular distance β, β 'of 30 to 120 °, in particular 80 to 100 °, preferably approximately 90 °, advantageously 30 to 60 °, in particular approximately 45 °, measured about the pivot axis 6, relative to the second locking reception 35' and the third locking reception 35 ″, respectively. In an embodiment, the angular distances β, β 'between the first locking receptacle 35 and the adjacent locking receptacles 35',35 ″ are equal. In an alternative embodiment of the working device, it may also be expedient to provide different angular distances. In the embodiment, the first locking receiver 35 is arranged on the lower side 41 of the housing 2. The first lock accommodating portion 35 is located in a vertical plane of the housing 2. The second locking reception 35' and the third locking reception 35 ″ are arranged symmetrically to one another in the preferred embodiment.

As shown in fig. 4, 8 and 9, the handle 5 comprises at least one contour 13, which in the operating position 21,22 interacts with at least one counter-contour 15 formed on the housing 2. In a preferred embodiment, the at least one contour 13 is formed at the journal 7, in particular on a side surface 18 of the journal 7 (fig. 4). In an alternative embodiment of the working device, it may be expedient to also provide the contour 13 at other locations of the handle 5. In the preferred embodiment, the counter contour 14 is formed in the receptacle 8, in particular at the inner face 43 of the receptacle 8 (fig. 6). As shown in fig. 4, the contour 13 is configured as a projection 14. The projection 14 thus forms a bulge on the side surface 18 of the journal 7, which extends in the radial direction starting from the pivot axis 6. The contour 13 extends over an angle γ in the circumferential direction of the pivot axis 6, wherein the angle γ preferably amounts to 5 to 25 °, in particular 5 to 15 °. In an alternative embodiment, the contour 13 may also extend over a smaller angle γ, for example if the contour 13 is configured only as a tip (spitz). In a preferred embodiment, the contour 13 extends parallel to the pivot axis 6 over a length b which corresponds to preferably at least 10%, in particular at least 20%, preferably approximately 25%, of the axial length a of the journal 7. In an alternative embodiment of the work apparatus 1, other dimensions of the contour 13 may also be suitable.

As shown in fig. 18, the mating profiles 15 are arranged at the ribs 48 of the housing 2. The counter contour 15 is formed on the inner side of the rib 38 facing the journal 7. The counter contour 15 extends over a width e measured in the direction of the pivot axis 6. The width e of the counter contour in the preferred embodiment preferably corresponds to the width of the rib 48 measured in the direction of the pivot axis 6. The width b of the contour 13 of the handle 5 is preferably greater than the width e of the counter-contour 15. In an embodiment, the width e of the counter contour 15 lies in the range of, in particular, 20 to 80%, preferably 30 to 60%, of the width b of the contour 13. As shown in fig. 18, the profile 13 has an end side 49 facing the rib 48. The counter contour 15 likewise has an end face 50 facing the journal 7. In the operating position 21, the end face 49 of the contour 13 and the end face 50 of the counter-contour 15 are in surface-type contact and form a common contact surface 51.

As shown in fig. 4 and 8, the handle 5 comprises four profiles 13. The profiles 13 adjacent to each other are preferably arranged at the same angular distance from each other with respect to the axis of oscillation 6. It may be expedient to provide only one contour 13, in particular two contours 13, preferably three contours 13 or more than four contours 13.

As shown in fig. 6, the mating contour 15 is configured as a housing projection 14. The receptacle 8 of the housing 2 is substantially cylindrical. The mating contour 15 forms a deviation of the cylindrical receptacle 8 in the form of a round chord (Kreissehne). The counter contour 15 extends in the direction of the pivot axis 6 relative to the pivot axis 6. In the preferred embodiment, four counter-profiles 15 are likewise provided, similar to the profile 13 at the handle 5. It may also be expedient to provide other numbers of counter contours 15. The mating contours 15 are formed at the receptacle 8 in such a way that adjacent mating contours 15 preferably have the same angular distance from one another in the circumferential direction of the pivot axis 6.

As shown in fig. 11, the profiles 13 at the handle 5 are preferably arranged in pairs. The two profiles 13 of the pair lie on a straight line 62,62' which perpendicularly intersects the pivot axis 6. By the paired arrangement of the contours 13, the journal 7 and the receptacle 8 are tensioned symmetrically with respect to the pivot axis 6. Tilting of the journal 7 relative to the receptacle 8 can thus be avoided. Similarly, the mating profiles 15 are preferably also arranged in pairs at the receptacle 8.

Fig. 8 shows a sectional view of the handheld work apparatus according to fig. 7, in which the arrangement of the contour 13 at the journal 7 and the mating contour 15 of the receptacle 8 is shown in the operating position 21. The contour 13 and the counter contour 15 of the handle 5 are designed in such a way that a transmittable friction torque M acting about the pivot axis 6 is provided between the handle 5 and the housing 2 in the operating positions 21,22 of the handle 5₂. In this case, the friction torque M₂It can act in both directions of rotation of the handle 5. In the operating position 21,22, the contour 13 of the handle 5 and the counter-contour 15 of the housing 2 are in contact such that the handle 5 is tensioned with the housing 2. The tension between the handle 5 and the housing 2 enables a friction torque M₂Transmission between the handle 5 and the housing 2 via the contour 13 and the counter-contour 15. This results in the operator of the work apparatus 1 having to apply an increase when turning the handle 5Torque in order to overcome the friction torque M₂And to pivot the handle 5 either into the operating position 21,22 or from the operating position 21,22 into the rest position 23.

As shown in fig. 10 to 12, the contour 13 and the counter contour 15 of the handle 5 are designed in such a way that a minimal friction torque M acting about the pivot axis 6 is provided between the handle 5 and the housing 2 in the inoperative position 23 of the handle 5₁. Frictional moment M₂Greater than friction torque M₁. In a preferred embodiment, the contour 13 and the counter contour 15 are designed such that the contour 13 and the counter contour 15 do not touch in the idle position 23. Thus, a bearing gap 12 is present between the handle 5 and the housing 2, wherein the bearing gap 12 is in particular a radial bearing gap. As a result, no friction torque can be transmitted between the contour 13 and the counter contour 15. Minimum friction moment M between profile 13 and counter-profile 15₁Is zero. The operator can swing the handle 5 relative to the housing 2 with only a small resistance. In an alternative embodiment of the work apparatus 1, it can be provided that the contour 13 and the counter contour 15 are only slightly in contact in the inoperative position 23, as a result of which at least only a small frictional torque M can be transmitted between the contour 13 and the counter contour 15₁. The smaller friction torque M₁Is also less than the friction torque M₂。

As shown in fig. 11, the contour 13 of the handle 5 has a distance c from the pivot axis 6 in the idle position 23. The counterpart contour 15 of the housing 2 has a spacing d from the pivot axis 6 in the inoperative position 23. The spacing c is greater than the spacing d. In other words, all the profiles 13 lie on a circle whose diameter is greater than the diameter of the circle interconnecting the mating profiles. This results in that if the contour 13 and the counter-contour 15 are located in a line aligned radially with respect to the pivot axis 6, the contour 13 and the counter-contour 15 come into contact and are tensioned there. Thus, a friction torque M can be transmitted between the profile 13 and the counter-profile 15₂. The course of the friction torque between the contour 13 and the counter contour 15 can be adjusted at will by the geometric design of the contour 13 and the counter contour 15. In order to produce a uniform increase in the friction torque, the profile 13 and the counter-profile are pivoted at their locationThe ends of the axis 6 in the circumferential direction are flattened. The friction torque can also be increased or decreased by the number of pairs of profiles 13 and counter-profiles 15. By the two-part construction of the housing 2, the housing 2 has an elasticity which allows a partial strain or displacement of the housing parts relative to one another when the handle 5 and the housing 2 are tensioned. Furthermore, the housing 2 is preferably formed of plastic. The elasticity of the plastic also causes at least partial strain of the housing 2. Thereby, the clamping between the profile 13 and the counter-profile 15 is facilitated.

Next, the process of swinging from the first operating position 21 to the second operating position 22 is explained in more detail:

the handle 5 is in the first operating position 21 (fig. 1, 8, 9). The profile 13 and the counter-profile 15 are in contact, whereby the housing 2 and the handle 5 are tensioned against each other. By tensioning the housing 2 and the handle 5, a friction torque M can be transmitted between the housing 2 and the handle 5₂. The locking device 24 is in the locked position. Thus, a form-fitting connection is present between the housing 2 and the handle 5 in the circumferential direction with respect to the pivot axis 6.

In order to release the handle 5 from the first operating position 21, the locking device 24 can be unlocked by pulling on the holding attachment 40, whereby the locking contour 34 is pulled out of the locking reception 35. A positive connection in the circumferential direction of the pivot axis 6 is eliminated. The handle 5 can now be rotated relative to the housing. For this purpose, the torque to be applied by the operator must be greater than the friction torque M that can be transmitted between the profile 13 of the handle 5 and the counter-profile 15 of the housing 2₂. The handle 5 is pivoted out of the first operating position 21 into the inoperative position 23. The profile 13 and the counter-profile 15 are no longer in contact. The tension between the housing 2 and the handle 5 is eliminated. A bearing gap 12 exists between the housing 2 and the handle 5, whereby a friction torque M is transferable between the contour 13 and the counter contour 15₁And minimum. The locking device 24 continues to be unlocked.

In order to pivot the handle 5 further out of the inoperative position 23 into the second operating position 22, the handle 5 must be pivoted further relative to the housing 2. In this case, the contour 13 of the handle 5 and the counter-contour 15 of the housing come into contact again, as a result of which the transmissible friction torque M₂And then rises again. The operator realizes that it mustThe torque to be applied is increased in order to move the handle 5 into the second operating position 22. The operator swings the handle 5 so far relative to the housing 2 that the locking device 24 locks again. In this case, the locking element 36 is pressed with the locking contour 34 into the locking receptacle 35 of the housing 2 via the spring element 38, as a result of which a form-fitting connection is again produced between the handle 5 and the housing 2 in the circumferential direction of the pivot axis 6. The handle 5 is now fixed relative to the housing 2 and in the second operating position 22.

Fig. 13 to 17 show a further exemplary embodiment of a work apparatus 1 according to the invention. As shown in fig. 13, the work apparatus 1 is configured as a suction cutter (Saugh ä cksler). Like reference numerals refer to like functional components. The work apparatus 1 comprises a suction tube 45, which is arranged at the housing 2. A drive motor 3 is arranged in the housing 2, which drives a fan wheel (not shown in greater detail) in order to generate a suction-acting air flow at the open end of the suction tube 45. Furthermore, the work apparatus 1 comprises a not shown comminuting device which cuts the articles sucked up via the suction tube 45 and comminutes them. A front handle 27, which is designed as a bow-type grip, is arranged on the housing 2.

As shown in fig. 14, the work apparatus 1 includes a rear handle (hereinafter referred to merely as handle 5) which is pivotably supported on the housing 2 about a pivot axis 6. The handle 5 is arranged in a first operating position 21 in fig. 14. The handle 5 can be pivoted about the pivot axis 6 in both directions of rotation into a second operating position 22 (fig. 15).

The journal 7 is formed on the handle 5. The handle 5 is pivotably mounted via a journal 7 arranged in a receptacle 8 of the housing 2.

As shown in fig. 15, the mating contour 15 is formed on the housing 2. The housing 2 comprises in this embodiment two mating profiles 15. One of the two mating contours 15 is formed on a first contact surface 46 of the housing 2. The first contact surface 46 extends obliquely to the pivot axis 6. The other of the two mating contours 15 is formed on a second contact surface 47 of the housing 2, wherein this contact surface 47 is likewise formed at an angle to the pivot axis 6. The inclined position of the contact surfaces 46,47 relative to the pivot axis 6 (Schr ä gstellung) is designed in such a way that the handle 5 is tensioned relative to the housing 2 both substantially axially in the direction of the pivot axis 6 and radially relative to the pivot axis 6. It may be expedient for the contact surfaces 46,47 to be designed such that the handle 5 is tensioned either axially relative to the pivot axis 6 or radially relative to the pivot axis 6. In this exemplary embodiment, the mating contour 15 is formed outside the receptacle 8 of the housing 2. The mating contour 15 is formed by two housing projections 16 arranged at a distance from one another.

As shown in fig. 16, at least one contour 13 is arranged on the underside of the handle 5 facing the housing 2. In the exemplary embodiment, a further contour 13, not shown, is provided, which is arranged on the side of the handle 5 opposite the pivot axis 6. By the paired arrangement of the contours 13, tilting of the handle 5 when tensioned with the housing 2 is avoided. The counter contour 13 is configured as a projection 14 at the underside of the handle 5. The end of the projection 14 in the circumferential direction of the pivot axis 6 is flattened. The contour 13 is located outside the journal 7 of the handle 5.

As shown in fig. 17, the contour 13 is tensioned with the mating contour 15 of the housing 2 in the first operating position 21 of the handle 5. In this position, the projection 14 of the handle 5 is located between two housing projections 16 spaced apart from one another, wherein the projection 14 is in contact with the housing projections 16. The handle 5 and the housing 2 are tensioned against each other similar to the above description. A transmittable friction torque M exists between the handle projection 14 and the housing projection 16₂. To release the handle 5 from the first operating position 21, the friction torque M₂Must be overcome by the torque applied by the operator. The handle is then in the rest position 23 (fig. 15, 16). In the rest position 23, the contour 13 and the counter-contour 15 are not in contact. The handle 5 is not tensioned with the housing 2, so that a minimum transmissible friction torque M is present₁. In order to transfer the handle 5 into the second operating position 22, the increased friction torque can be applied again until the projection 14 locks up between the two housing projections 16. In order to pivot the handle 5 from the first operating position 21 into the second operating position 22, the handle must be rotated through 180 ° about the pivot axis 6.

Claims

1. A hand-held power tool, comprising a housing (2), a drive motor (3) for driving a tool (4), and a handle (5) arranged on the housing (2), wherein the handle (5) is mounted on the housing (2) such that it can pivot about a pivot axis (6), wherein the handle (5) can be pivoted into at least one operating position (21,22) and into at least one inoperative position (23),

characterized in that a contour (13) is provided at the handle (5) and a counter contour (15) is provided at the housing (2), and in that the contour (13) and the counter contour (15) are designed in such a way that a minimal friction torque (M) acting about the pivot axis (6) is provided between the handle (5) and the housing (2) in the inoperative position (23) of the handle (5)₁) And in the operating position (21,22) of the handle (5), the contour (13) and the counter contour (15) are in operative connection in such a way that a further friction torque (M) acting about the pivot axis (6) is present between the handle (5) and the housing (2)₂) Wherein the further friction torque (M) in the operating position (21,22)₂) Greater than the minimum friction torque (M) in the rest position (23)₁)。

2. The working device according to claim 1, characterized in that in the inoperative position (23) of the handle (5) there is a bearing gap (12) between the handle (5) and the housing (2) and in the operative position (21,22) of the handle (5) the contour (13) and the counter contour (15) are in operative connection such that the housing (2) and the handle (5) are tensioned against each other.

3. The working instrument according to claim 2, characterized in that the bearing gap (12) is a bearing gap radial with respect to the oscillation axis (6).

4. The working instrument according to claim 2, characterized in that the bearing play (12) is eliminated in the operating position (21,22) of the handle (5) by the co-action of the contour (13) of the handle (5) and the counter-contour (15) of the housing (2).

5. The working instrument according to claim 1, characterized in that the contour (13) is configured as a projection (14) at the handle (5).

6. The working instrument according to claim 1, characterized in that the counter contour (15) is configured as a housing projection (16).

7. The work apparatus according to claim 1, characterized in that the contact surfaces of the contour (13) and the counter contour (15) which are in operative connection with one another are designed such that the friction torque increases when the handle (5) is pivoted out of the inoperative position (23) into the operating position (21, 22).

8. The working device according to claim 1, characterized in that the mutual bearing (9) of the housing (2) and the handle (5) is formed by a journal (7) bearing in a receptacle (8).

9. The work apparatus according to claim 8, characterized in that the journal (7) is configured at the handle (5) and the receptacle (8) is configured at the housing (2).

10. The working instrument according to claim 8, characterized in that the at least one contour (13) is configured at the journal (7) and the at least one counter contour (15) is configured at the receptacle (8).

11. The working instrument according to claim 1, characterized in that at least two contours (13) are provided at the handle (5).

12. The working instrument according to claim 11, characterized in that the profiles (13) are arranged at the handle (5) offset from each other at a uniform angular distance.

13. The working instrument according to claim 11, characterized in that the number of profiles (13) corresponds to the number of counter profiles (15).

14. The working instrument according to claim 11, characterized in that a locking device (24) which is configured separately from the contour (13) and the counter contour (15) is provided for locking the handle (5) in the operating position (21, 22).

15. The working instrument according to claim 14, characterized in that the contour (13) and the counter contour (15) are configured such that in the operating position (21,22) of the handle (5) the contour (13) and the counter contour (15) engage when the locking device (24) is locked.

16. The working instrument according to claim 11, characterized in that at least three profiles (13) are provided at the handle (5).

17. The working instrument according to claim 16, characterized in that at least four contours (13) are provided at the handle (5).